Content to add to a text box placeholder, specified as a character
vector, array, cell array, or Paragraph object.
If you specify an array, include only mlreportgen.ppt.Paragraph objects
in the array. If you specify a cell array, you can include character
vectors and mlreportgen.ppt.Paragraph objects.

contents — Multiple paragraphs to addcell array of character vectors or mlreportgen.ppt.Paragraph objects
or a combination of both | cell array of mlreportgen.ppt.Paragraph objects | cell array of a combination of character vectors and mlreportgen.ppt.Paragraph objects